<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style type="text/css">
	h1{
	 border:1px solid red;
	 width: 20%;
	}
	h2{
	border:10px solid blue;
	width:10%;
	}
</style>
</head>
<body>
	<h1>标题一</h1>
	<h2>标题二</h2>
	<h3>标题三</h3>
	<h4>标题四</h4>
</body>
</html>